AT89S2051-24SC datasheet(13/45 Pages) ATMEL

13 / 45 page

3390C–MICRO–7/05

AT89S2051/S4051

14. Interrupt Registers

Table 14-1.

– Interrupt Enable Register

IE = A8H

Reset Value = 00X0 0000B

Bit Addressable

–

ET1

EX1

ET0

EX0

Bit

65432

Symbol

Function

Global enable/disable. All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is enabled/disabled

by setting/clearing its own enable bit.

Comparator Interrupt Enable

Serial Port Interrupt Enable

ET1

Timer 1 Interrupt Enable

EX1

External Interrupt 1 Enable

ET0

Timer 0 Interrupt Enable

EX0

External Interrupt 0 Enable

Table 14-2.

– Interrupt Priority Register

IP = B8H

Reset Value = X0X0 0000B

Bit Addressable

–

PT1

PX1

PT0

PX0

Bit

65432

Symbol

Function

Comparator Interrupt Priority Low

Serial Port Interrupt Priority Low

PT1

Timer 1 Interrupt Priority Low

PX1

External Interrupt 1 Priority Low

PT0

Timer 0 Interrupt Priority Low

PX0

External Interrupt 0 Priority Low

Table 14-3.

IPH

– Interrupt Priority High Register

IPH = B7H

Reset Value = X0X0 0000B

Not Bit Addressable

–

PCH

–

PSH

PT1H

PX1H

PT0H

PX0H

Bit

65432

Symbol

Function

PCH

Comparator Interrupt Priority High

PSH

Serial Port Interrupt Priority High

PT1H

Timer 1 Interrupt Priority High

PX1H

External Interrupt 1 Priority High

PT0H

Timer 0 Interrupt Priority High

PX0H

External Interrupt 0 Priority High

AT89S2051-24SC Datasheet(PDF) 13 Page - ATMEL Corporation

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